Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm
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Published:2019-11-22
Issue:22
Volume:19
Page:14149-14171
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Benavent-Oltra Jose AntonioORCID, Román RobertoORCID, Casquero-Vera Juan AndrésORCID, Pérez-Ramírez DanielORCID, Lyamani HassanORCID, Ortiz-Amezcua Pablo, Bedoya-Velásquez Andrés Esteban, de Arruda Moreira Gregori, Barreto África, Lopatin Anton, Fuertes David, Herrera Milagros, Torres Benjamin, Dubovik Oleg, Guerrero-Rascado Juan LuisORCID, Goloub Philippe, Olmo-Reyes Francisco Jose, Alados-Arboledas LucasORCID
Abstract
Abstract. This study evaluates the potential of the GRASP algorithm (Generalized Retrieval of Aerosol and Surface Properties) to retrieve continuous
day-to-night aerosol properties, both column-integrated and
vertically resolved. The study is focused on the evaluation of GRASP
retrievals during an intense Saharan dust event that occurred during the
Sierra Nevada Lidar aerOsol Profiling Experiment I (SLOPE I) field campaign. For daytime aerosol retrievals, we combined the measurements of the ground-based lidar from EARLINET (European Aerosol Research Lidar Network) station and sun–sky photometer from AERONET (Aerosol Robotic Network), both instruments co-located in Granada (Spain). However, for night-time retrievals three different combinations of active and passive remote-sensing measurements are proposed. The first scheme (N0) uses lidar night-time measurements in combination with the interpolation of sun–sky daytime measurements. The other two schemes combine lidar night-time measurements with night-time aerosol optical depth obtained by lunar photometry either using intensive properties of the aerosol retrieved during sun–sky daytime measurements (N1) or using the Moon aureole radiance obtained by sky camera images (N2). Evaluations of the columnar aerosol properties retrieved by GRASP are done
versus standard AERONET retrievals. The coherence of day-to-night evolutions
of the different aerosol properties retrieved by GRASP is also studied. The
extinction coefficient vertical profiles retrieved by GRASP are compared
with the profiles calculated by the Raman technique at night-time with
differences below 30 % for all schemes at 355, 532 and 1064 nm. Finally,
the volume concentration and scattering coefficient retrieved by GRASP at
2500 m a.s.l. are evaluated by in situ measurements at this height at Sierra Nevada Station. The differences between GRASP and in situ measurements are similar for the different schemes, with differences below 30 % for both volume concentration and scattering coefficient. In general, for the scattering coefficient, the GRASP N0 and N1 show better results than the GRASP N2 schemes, while for volume concentration, GRASP N2 shows the lowest differences against in situ measurements (around 10 %) for high aerosol optical depth values.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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